The invention discloses a bearing drilling device with a better clamping effect. The bearing drilling device comprises a workbench, wherein two sides of the workbench are fixedly connected with supporting frames; the middle end of the top of the workbench is fixedly connected with a bearing placing seat; a bearing placing slot and a strip-type slot are formed in the bearing placing seat; a bearing is placed in the bearing placing slot; a working box is arranged between the two supporting frames and fixedly connected with a drilling device and two hydraulic telescopic rods; the drilling device is positioned between the two hydraulic telescopic rods; the bottoms of the telescopic ends of the hydraulic telescopic rods are fixedly connected with connection plates; the bottoms of the connection plates are fixedly connected with pressing columns. The bearing drilling device with the better clamping effect is simple in structure and convenient to use, can clamp the upper and lower parts of a bearing during drilling, and is better in clamping effect and more accurate in drilling.